WO2014192866A1 - Catheter for optical coherence tomograph, and catheter production method - Google Patents
Catheter for optical coherence tomograph, and catheter production method Download PDFInfo
- Publication number
- WO2014192866A1 WO2014192866A1 PCT/JP2014/064255 JP2014064255W WO2014192866A1 WO 2014192866 A1 WO2014192866 A1 WO 2014192866A1 JP 2014064255 W JP2014064255 W JP 2014064255W WO 2014192866 A1 WO2014192866 A1 WO 2014192866A1
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- WIPO (PCT)
- Prior art keywords
- optical fiber
- catheter
- optical
- ferrule
- metal tube
- Prior art date
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/36—Mechanical coupling means
- G02B6/38—Mechanical coupling means having fibre to fibre mating means
- G02B6/3807—Dismountable connectors, i.e. comprising plugs
- G02B6/3833—Details of mounting fibres in ferrules; Assembly methods; Manufacture
- G02B6/3846—Details of mounting fibres in ferrules; Assembly methods; Manufacture with fibre stubs
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
- A61B5/0062—Arrangements for scanning
- A61B5/0066—Optical coherence imaging
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
- A61B5/0082—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence adapted for particular medical purposes
- A61B5/0084—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence adapted for particular medical purposes for introduction into the body, e.g. by catheters
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/25—Preparing the ends of light guides for coupling, e.g. cutting
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/255—Splicing of light guides, e.g. by fusion or bonding
- G02B6/2551—Splicing of light guides, e.g. by fusion or bonding using thermal methods, e.g. fusion welding by arc discharge, laser beam, plasma torch
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/36—Mechanical coupling means
- G02B6/3604—Rotary joints allowing relative rotational movement between opposing fibre or fibre bundle ends
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/36—Mechanical coupling means
- G02B6/38—Mechanical coupling means having fibre to fibre mating means
- G02B6/3807—Dismountable connectors, i.e. comprising plugs
- G02B6/381—Dismountable connectors, i.e. comprising plugs of the ferrule type, e.g. fibre ends embedded in ferrules, connecting a pair of fibres
- G02B6/3823—Dismountable connectors, i.e. comprising plugs of the ferrule type, e.g. fibre ends embedded in ferrules, connecting a pair of fibres containing surplus lengths, internal fibre loops
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/36—Mechanical coupling means
- G02B6/38—Mechanical coupling means having fibre to fibre mating means
- G02B6/3807—Dismountable connectors, i.e. comprising plugs
- G02B6/381—Dismountable connectors, i.e. comprising plugs of the ferrule type, e.g. fibre ends embedded in ferrules, connecting a pair of fibres
- G02B6/3825—Dismountable connectors, i.e. comprising plugs of the ferrule type, e.g. fibre ends embedded in ferrules, connecting a pair of fibres with an intermediate part, e.g. adapter, receptacle, linking two plugs
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/36—Mechanical coupling means
- G02B6/38—Mechanical coupling means having fibre to fibre mating means
- G02B6/3807—Dismountable connectors, i.e. comprising plugs
- G02B6/3869—Mounting ferrules to connector body, i.e. plugs
- G02B6/387—Connector plugs comprising two complementary members, e.g. shells, caps, covers, locked together
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4292—Coupling light guides with opto-electronic elements the light guide being disconnectable from the opto-electronic element, e.g. mutually self aligning arrangements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/255—Splicing of light guides, e.g. by fusion or bonding
- G02B6/2558—Reinforcement of splice joint
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/36—Mechanical coupling means
- G02B6/3616—Holders, macro size fixtures for mechanically holding or positioning fibres, e.g. on an optical bench
- G02B6/3624—Fibre head, e.g. fibre probe termination
Definitions
- the present invention relates to a catheter for optical coherence tomography apparatus and a manufacturing method thereof.
- Patent Document 1 describes a connection method between a catheter and a rotary joint in an optical coherence tomography (OCT) apparatus that images a hole from the inside. In this connection method, an FC / APC connector is used.
- Patent Document 2 describes the configuration of a catheter for an OCT apparatus. This catheter includes an inner body that rotates and an outer body that covers the inner body, and includes an optical connector that is connected to a rotary joint.
- Patent Document 3 Japanese Patent Application Laid-Open No. 2009-205100 (Patent Document 3), Japanese Patent Application Laid-Open No. 2011-118348 (Patent Document 4), and Japanese Patent Application Laid-Open No. 2008-197622 (Patent Document 5) disclose so-called fusion-type field assembly single-core light.
- the connector is listed.
- the fusion-type field assembly single-core optical connector can be attached to an optical fiber in the field, and includes a ferrule and a short optical fiber attached to the ferrule.
- the tip of the short optical fiber on the ferrule side has already been polished, and the rear end of the short optical fiber and the tip of the optical fiber to be attached are fusion-bonded on site.
- the present invention provides a catheter for an OCT apparatus that can reduce manufacturing costs while shortening assembly time, and can reduce breakage of a fusion spliced portion between a short optical fiber and an interior body side optical fiber, and a method for manufacturing the same.
- the purpose is to provide.
- a ferrule assembly including an inner body that contains a first optical fiber and is inserted into the body, and a second optical fiber and a ferrule fixed to one end of the second optical fiber.
- an optical coherence tomography apparatus catheter comprising a tube that is directly or indirectly fixed to the ferrule assembly and that guides the interior body, and an optical connector portion connected to a rotary joint of the optical coherence tomography apparatus.
- a method of manufacturing is provided. In this method, a ferrule assembly including a first length of an embedded optical fiber is selected as the second optical fiber, and the sum of the lengths of the first optical fiber and the second optical fiber is a predetermined length.
- the first step when the cutting of the first optical fiber fails or when the fusion fails, the second optical fiber includes a built-in optical fiber having a second length longer than the first length. While selecting the ferrule assembly, the first optical fiber is cut again to form the fusion splice.
- an internal body that contains a first optical fiber and is inserted into the body, and (2) a second optical fiber and one end of the second optical fiber are fixed.
- a ferrule assembly including a ferrule, and an optical connector portion having one end directly or indirectly fixed to the ferrule assembly and guiding the interior body, and connected to a rotary joint of the optical coherence tomography apparatus; 3)
- a catheter for an optical coherence tomography apparatus is provided that includes a fusion splicing portion located in a tube in which the other end of the second optical fiber and one end of the first optical fiber are fused together.
- the manufacturing cost can be suppressed while shortening the assembling time, and the breakage of the fusion spliced portion between the short optical fiber and the inner body side optical fiber can be reduced. Can do.
- FIG. 1 is a perspective view showing a state in which an exterior body of a catheter for an OCT apparatus according to an embodiment is removed.
- FIG. 2 is an exploded perspective view of the optical connector portion.
- FIG. 3 is a cross-sectional view taken along the longitudinal direction of the optical connector portion.
- FIG. 4 is an enlarged cross-sectional view showing a detailed configuration of the ferrule assembly and the joint member.
- FIG. 5A and 5B are views showing the shape of the joint member, where FIG. 5A is a front view, FIG. 5B is a side view, FIG. 5C is a rear view, and FIG.
- FIG. 6 is a cross-sectional view along the longitudinal direction of an optical connector portion according to a modification.
- FIG. 7 is a cross-sectional view along the longitudinal direction of an optical connector portion according to another modification.
- FIG. 8 is a conceptual diagram showing a fusion splicing portion in which one end on the proximal end side of the optical fiber built in the interior body and the other end of the short optical fiber are fused to each other.
- FIG. 9 is a flowchart showing a method for manufacturing the catheter for the OCT apparatus.
- FIG. 10 is a conceptual diagram showing an interior body, a metal tube, and a ferrule assembly.
- FIG. 11 is a conceptual diagram showing another example of a fixing structure of a ferrule assembly and a metal tube as a modified example.
- FIG. 12 is a conceptual diagram showing the configuration of the joint member.
- FIG. 13 is a cross-sectional view showing the shape of the joint member.
- the present inventor considered applying a fusion-type locally assembled single-core optical connector to a catheter for an OCT apparatus.
- the polishing step can be omitted when assembling the catheter.
- the fusion-type locally assembled single-core optical connector is inexpensive, and the manufacturing cost can be reduced.
- the optical path length of the optical fiber In the OCT device catheter, it is necessary to set the optical path length of the optical fiber to a predetermined length in order to observe the interference waveform.
- the tolerance of the optical path length is a small value such as ⁇ 5 mm or ⁇ 2 mm.
- the length of the short optical fiber is constant. If the fusion spliced part between the short optical fiber and the optical fiber on the inner body side is broken, the optical fiber on the inner body side is slightly shorter when it is fused again, so the optical path length does not fall within the allowable error. There is a fear.
- FIG. 1 is a perspective view showing a state in which an outer package of an OCT catheter 1A according to an embodiment of the present invention is removed.
- the catheter for an OCT apparatus 1A includes an inner body (torque wire) 10 that is inserted into the body, and an optical connector unit 30 that is connected to a rotary joint of the OCT apparatus.
- a lens 12 for irradiating light into the body and taking in interference light is attached to the tip of the interior body 10.
- the interior body 10 includes an optical fiber (first optical fiber) that optically couples the optical connector 30 and the lens 12.
- a base end portion (a portion that is not inserted into the body) of the inner body 10 is inserted into one end of a metal tube 20 to be described later, and is held in a state of being movable in the longitudinal direction.
- FIG. 2 is an exploded perspective view of the optical connector portion 30.
- FIG. 3 is a cross-sectional view of the optical connector 30 along the longitudinal direction.
- the optical connector unit 30 is a so-called fusion spliced SC connector.
- the optical connector unit 30 includes a ferrule assembly 31, a metal tube 20 that is directly or indirectly fixed to the ferrule assembly 31 and guides the interior body 10, and a joint for fixing the metal tube 20 to the ferrule assembly 31.
- a member 32, a plug housing 33 that accommodates the ferrule assembly 31 and the joint member 32, and a knob 34 that covers the plug housing 33 are provided.
- the metal tube 20 guides the interior body 10 in the longitudinal direction during pullback or the like, and holds the base end portion of the interior body 10 so as not to bend.
- the ferrule assembly 31 includes a short optical fiber (also referred to as a second optical fiber or a built-in optical fiber) 35, a substantially cylindrical ferrule 36 that is fixed to one end of the short optical fiber 35 and holds the short optical fiber 35. And a metallic cylindrical flange member 37 fixed to the ferrule 36.
- the ferrule 36 holds the short optical fiber 35 along its central axis.
- the front end surface (front end surface) of the ferrule 36 is polished so as to be inclined at a predetermined angle (for example, 8 degrees) with respect to a surface perpendicular to the central axis of the short optical fiber 35.
- the short optical fiber 35 extends from the ferrule assembly 31 to the metal tube 20 side by a predetermined length.
- the end face on the base end side of the optical fiber built in the interior body 10 is fused and connected to the end face of the short optical fiber 35 on the metal tube 20 side.
- the fusion splicing portion between the optical fiber built in the interior body 10 and the short optical fiber 35 is located inside the metal tube 20.
- FIG. 4 is an enlarged cross-sectional view showing a detailed configuration of the ferrule assembly 31 and the joint member 32.
- 5A and 5B are views showing the shape of the joint member 32, where FIG. 5A is a front view, FIG. 5B is a side view, FIG. 5C is a rear view, and FIG.
- the flange member 37 has a cylindrical shape extending along the axial direction of the short optical fiber 35, one end of which is fitted and fixed to the other end of the ferrule 36, and the short optical fiber 35 is inserted into the inside of the flange member 37. ing.
- the flange member 37 has a flange portion 37 a protruding in a direction intersecting the axial direction of the short optical fiber 35, and the flange portion 37 a is brought into contact with a convex portion formed on the inner wall surface of the plug housing 33. This contributes to the positioning of the ferrule assembly 31.
- the inner diameter of the flange member 37 is sufficiently larger than the diameter of the short optical fiber 35.
- a gap between the flange member 37 and the short optical fiber 35 is filled with a resin 38 for holding the short optical fiber 35.
- the resin 38 is made of a resin material such as an epoxy resin or an acrylic resin.
- the joint member 32 is a member for fixing the metal tube 20 to the ferrule assembly 31.
- the joint member 32 has a substantially cylindrical shape, and has a front portion 32a on one end side having a first inner diameter L1, and a second inner diameter L2 smaller than the first inner diameter L1. And a rear portion 32b on the other end side.
- the inner diameter and the outer diameter of the rear portion 32b that is, the portion where the metal tube 20 is inserted in the joint member 32 are constant, in other words, the area of the cross section perpendicular to the longitudinal direction of the portion is constant. .
- the short optical fiber 35 is inserted from the front portion 32a to the rear portion 32b.
- the joint member 32 is made of a material such as SUS304.
- the joint member 32 is a joint member (rotates at high speed) with the rotary joint. As long as it is housed inside the member that covers the optical connector portion 30, the length may not fit inside the plug housing 33.
- the optical connector 30 rotates at a high speed. At this time, rotational force is transmitted to the interior body 10 through the metal tube 20, but depending on the material and structure of the metal tube 20, resonance may occur at the natural angular frequency. Therefore, it is desirable that the joint member 32 has a length that prevents such resonance.
- FIG. 6 is a cross-sectional view taken along the longitudinal direction of the optical connector 30 according to a modification.
- the OCT catheter 1 ⁇ / b> A further includes an exterior body 41.
- the exterior body 41 is a cylindrical member that covers the interior body 10 and the optical connector unit 30.
- One end of the exterior body 41 is fixed to the OCT apparatus, and the interior body 10 and the optical connector unit 30 rotate with respect to the OCT apparatus. The body does not rotate and remains stationary.
- a gap between the exterior body 41 and the interior body 10 is filled with a liquid such as physiological saline.
- the exterior body 41 has a support portion 42 that supports the interior body 10 or the metal tube 20 inside thereof.
- the support part 42 holds the metal tube 20.
- the support portion 42 is a water stop valve for preventing the liquid from flowing into the optical connector portion 30.
- the length of the joint member 32 is such that the distance L between the other end 32 c of the joint member 32 and the support portion 42 is the number of rotations of the optical connector portion 30 used (for example, 0 rpm to 12000 rpm). Within the range, it may be determined to be outside the length range in which the resonance of the metal tube 20 occurs.
- the distance L at which resonance occurs in the metal tube 20 is determined as follows. That is, the distance between the other end 32c of the joint member 32 and the support portion 42 is L, the bending rigidity (Young's modulus) of the metal tube 20 is E, the sectional moment of the metal tube 20 is I, the order of resonance is i, the metal the density of the tube 20 [rho, and the area of the section vertical to the central axis of the metal tube 20 and a, natural angular frequency p i of the metal tube 20 is expressed by the following equation (1).
- the longer the distance L the smaller the resonance frequency.
- the natural angular frequency p i and uses rotational frequency of optical connector section 30, by calculating the value of the distance L corresponding to the rotational frequency for said use, the distance L in which the resonance is generated in the metal tube 20
- the range is determined.
- the length of the joint member 32 may be determined so that the distance L is outside the range.
- the support part 42 stops. Therefore, when the joint member 32 moves in the axial direction by the pull-back operation, the distance L changes.
- the range of the distance L may be determined in consideration of such changes.
- the metal tube 20 is preferably made of a material that is difficult to plastically deform (for example, SUS304).
- FIG. 7 is a cross-sectional view along the longitudinal direction of the optical connector 30 according to another modification.
- the exterior body 41 has a portion having a first inner diameter D1 and a portion having a second inner diameter D2 smaller than the first inner diameter D1 (constriction portion). including.
- the narrowed portion may be regarded as another support portion 41a.
- the distance L may be determined as the distance between the other end 32c of the joint member 32 and the support portion 41a.
- FIG. 8 one end of the base end side of the optical fiber 14 (first optical fiber) built in the interior body 10 and the other end of the short optical fiber 35 (second optical fiber) are fused together.
- the catheter 1A for OCT apparatus further includes such a fusion splicing portion S.
- the fusion splicing portion S is located inside the metal tube 20 and is protected by the metal tube 20 to prevent breakage.
- a protection mechanism for protecting these glass fibers may be provided at a location where the glass fibers of the optical fiber 14 and the glass fibers of the short optical fiber 35 are exposed.
- various structures such as a tube fixed with an adhesive, a heat shrinkable tube, a curing agent applied using a pen, and the like are applied.
- FIG. 9 is a flowchart showing a manufacturing method of the OCT device catheter 1A.
- a plurality of ferrule assemblies 31 including short optical fibers 35 having different lengths are prepared (step S11).
- the ferrule assembly 31 in which the short optical fiber 35 has a certain length is selected from the plurality of ferrule assemblies 31 (step S12).
- the optical fiber 14 is cut so that the sum of the lengths of the optical fiber 14 and the short optical fiber 35 becomes a predetermined length, that is, an optical path length necessary for observing the interference waveform (step S13).
- one end of the optical fiber 14 and the other end of the short optical fiber 35 are fused together to form a fusion splicing portion S (step S14).
- the cutting (step S13) and the fusing (step S14) of the optical fiber 14 may fail (step S15; No).
- the ferrule assembly 31 including the short optical fiber 35 having the second length longer than the first length is selected (step S12).
- the optical fiber 14 is cut again so that the sum of the lengths of the optical fiber 14 and the short optical fiber 35 becomes a predetermined length (step S13), and the fusion splicing portion S is formed again (step S14).
- the optical path lengths of the optical fiber 14 and the short optical fiber 35 and the fusion state of the fusion splicing portion S may be inspected (step S16).
- the short length of the second length that is longer than the first length is used.
- the ferrule assembly 31 including the optical fiber 35 is selected (step S12).
- the optical fiber 14 may be cut again so that the sum of the lengths of the optical fiber 14 and the short optical fiber 35 becomes a predetermined length (step S13), and the fusion splicing portion S may be formed again (step S14). .
- the fusion splicing portion S is inserted into the metal tube 20, and the metal tube 20 is attached to the ferrule assembly 31 via the joint member 32. Thereafter, the ferrule assembly 31 is accommodated in the plug housing 33, and the knob 34 is assembled to complete the OCT apparatus catheter 1A.
- the fusion splicing portion S is located inside the metal tube 20. Also in the manufacturing method of the OCT apparatus catheter 1A, the fusion splicing portion S is inserted into the metal tube 20 in the second step S20. Thereby, since the fusion splicing part S is effectively protected by the metal tube 20, the fracture
- FIG. 10 is a conceptual diagram for explaining the problem, and schematically shows the interior body 10, the metal tube 20, and the ferrule assembly 31.
- FIG. 10A it is assumed that the short optical fiber 35 and the optical fiber 14 are fused to each other at the fusion splicing portion S.
- the optical fiber 14 needs to be cut and fused again with the short optical fiber 35 of another ferrule assembly 31.
- the optical fiber 14 becomes too short by cutting the optical fiber 14, the optical path length of the optical fiber 14 and the short optical fiber 35 is longer than a predetermined length as shown in FIG. Since it becomes shorter, such an interior body 10 cannot be used. Since the interior body 10 is very expensive, it is not preferable that the interior body 10 cannot be used. Such a problem may also occur when the optical fiber 14 has failed to be cut.
- the ferrule assembly 31 having the longer short optical fiber 35 is selected. After the optical fiber 14 is cut again, the fusion splicing portion S is formed again. As a result, as shown in FIG. 10C, the optical path length of the optical fiber 14 and the short optical fiber 35 can be adjusted to a predetermined length, and the interior body 10 can be used continuously. it can.
- the optical connector portion 30 has a cylindrical flange member 37 having one end fixed to the ferrule 36 so that the short optical fiber 35 is inserted therein, and the other end of the flange member 37. It has a cylindrical joint member 32 fitted at one end, and the metal tube 20 is inserted and fixed to the other end side of the joint member 32.
- the inner body and the optical connector portion are covered, and the inner body and the optical connector portion are attached to the outer body that is stationary without rotating and the inner body is supported to support the tube.
- the distance L between the other end 32c of the joint member 32 and the support portion 42 is outside the range of the length that causes the resonance of the metal tube 20 within the range of the rotational speed of use of the optical connector portion 30. As described above, the length of the joint member 32 is determined. Thereby, the vibration by the resonance of the metal tube 20 can be avoided and the burden on the patient can be reduced.
- FIG. 11 is a conceptual diagram showing another example of the fixing structure of the ferrule assembly 31 and the metal tube 20 as a modification of the embodiment.
- the gap between the flange member 37 and the short optical fiber 35 is not filled with resin, and the metal tube 20 is inserted into the flange member 37 and fixed.
- One end of the metal tube 20 is in contact with the other end surface of the ferrule 36.
- the operation can be easily performed in a short time, and the manufacturing cost can be suppressed.
- the fusion splicing portion S is effectively protected by the metal tube 20 by the fusion splicing portion S being located inside the metal tube 20, breakage of the fusion splicing portion S can be reduced. .
- the metal tube 20 may not be sufficiently fixed. If the metal tube 20 cannot be sufficiently fixed, the metal tube 20 may not be stable during high-speed rotation of the OCT apparatus catheter 1A by the rotary joint. In such a case, the ferrule assembly 31 and the metal tube 20 may be fixed to each other via the joint member 32 as in the above embodiment.
- FIG. 12 is a conceptual diagram showing the shape of the joint member 43 as another modification of the embodiment.
- 12A is a side sectional view of the joint member 43
- FIG. 12B is a sectional view taken along line XIb-XIb
- FIG. 12C is a sectional view taken along line XIc-XIc.
- the optical connector unit 30 may include a joint member 43 instead of the joint member 32.
- the area of the cross section A2 (FIG. 12C) perpendicular to the axial direction of the metal tube 20 on the other end side of the rear portion 43b in which the metal tube 20 is inserted is on one end side of the rear portion 43b. It is smaller than the area of the cross section A1 (FIG.
- a tapered portion 43c having an outer diameter that gradually decreases from one end side to the other end side is provided between one end side and the other end side of the rear portion 43b.
- the outer diameter of the portion 43d from the tapered portion 43c to one end is D1
- the outer diameter of the portion 43e from the tapered portion 43c to the other end is D2 ( ⁇ D1).
- stress concentration occurs at the boundary between the portion held by the joint member and the portion not held (that is, near the other end of the joint member), and the largest bending stress is generated. Since the bending rigidity of the rear part of the joint member becomes smaller as it approaches the other end as in this modification, stress concentration of the metal tube 20 can be avoided and damage to the metal tube 20 can be reduced.
- FIG. 13 is a conceptual diagram showing the shape of another joint member 44 according to this modification, and is a side sectional view along the axial direction of the joint member 44.
- the tapered portion 44 c reaches the other end of the joint member 44. Even if it is such a form, the effect of this modification can be show
- the manufacturing method of the catheter for OCT apparatuses which concerns on this invention, and suitable embodiment of the catheter for OCT apparatuses were described, this invention is not necessarily restricted to said each embodiment, In the range which does not deviate from the summary, it is various. It can be changed.
- the optical connector portion is a fusion splicing SC connector is illustrated, but the optical connector portion may be a fusion splicing connector other than the fusion splicing SC connector.
- the metal pipe was illustrated as an example of the pipe
Abstract
Description
図11は、上記実施形態の一変形例として、フェルール組み立て体31と金属管20との固定構造の別の例を示す概念図である。本変形例では、フランジ部材37と短尺光ファイバ35との隙間に樹脂が充填されておらず、金属管20はフランジ部材37に挿入され、固定されている。金属管20の一端は、フェルール36の他端面に接している。この場合であっても、上述した実施形態と同様に、作業を短時間で且つ簡易に行うことができ、且つ製造コストを抑えることができる。また、融着接続部Sが金属管20の内部に位置することにより、融着接続部Sが金属管20によって効果的に保護されるので、融着接続部Sの破断を低減することができる。 (First modification)
FIG. 11 is a conceptual diagram showing another example of the fixing structure of the
図12は、上記実施形態の別の変形例として、継ぎ手部材43の形状を示す概念図である。図12(a)は継ぎ手部材43の側断面図であり、図12(b)はXIb-XIb断面図であり、図12(c)はXIc-XIc断面図である。光コネクタ部30は、継ぎ手部材32に代えて、継ぎ手部材43を備えてもよい。継ぎ手部材43では、金属管20が挿入されている後部43bの他端側における、金属管20の軸方向に垂直な断面A2(図12(c))の面積が、後部43bの一端側における、金属管20の軸方向に垂直な断面A1(図12(b))の面積よりも小さい。具体的には、後部43bの一端側と他端側との間に、一端側から他端側に向けて外径が徐々に小さくなるテーパ部43cが設けられている。そして、テーパ部43cから一端までの部分43dの外径がD1となっており、テーパ部43cから他端までの部分43eの外径がD2(<D1)となっている。 (Second modification)
FIG. 12 is a conceptual diagram showing the shape of the
Claims (5)
- 第1の光ファイバを内蔵しており体内に挿入される内装体と、
第2の光ファイバと前記第2の光ファイバの一端側に固定されたフェルールとを含むフェルール組み立て体、及び前記フェルール組み立て体に一端が直接または間接に固定され前記内装体を案内する管を有し、光干渉断層撮影装置のロータリジョイントに接続される光コネクタ部と
を備える光干渉断層撮影装置用カテーテルを製造する方法であって、
前記第2の光ファイバとして第1の長さの組み込み光ファイバを含む前記フェルール組み立て体を選択するとともに、前記第1の光ファイバと前記第2の光ファイバとの長さの和が所定の長さとなるように前記第1の光ファイバをカットしたのち、前記第1の光ファイバの一端と前記第2の光ファイバの他端とを互いに融着して融着接続部を形成する第1ステップと、
前記融着接続部を前記管内に挿入する第2ステップと
を備え、前記第1ステップにおいて、前記第1の光ファイバのカットを失敗した場合、若しくは融着を失敗した場合に、第2の光ファイバとして前記第1の長さよりも長い第2の長さの組み込み光ファイバを含む前記フェルール組み立て体を選択するとともに、前記第1の光ファイバを再びカットし、前記融着接続部を再び形成する光干渉断層撮影装置用カテーテルの製造方法。 An interior body containing the first optical fiber and inserted into the body;
A ferrule assembly including a second optical fiber and a ferrule fixed to one end of the second optical fiber, and a pipe that is directly or indirectly fixed to the ferrule assembly and guides the inner body. An optical coherence tomography apparatus catheter comprising an optical connector connected to a rotary joint of the optical coherence tomography apparatus,
The ferrule assembly including the first length of the built-in optical fiber is selected as the second optical fiber, and the sum of the lengths of the first optical fiber and the second optical fiber is a predetermined length. The first step of cutting the first optical fiber so that the end of the first optical fiber and the other end of the second optical fiber are fused together to form a fusion splicing portion. When,
A second step of inserting the fusion splicing part into the tube, and in the first step, if the cutting of the first optical fiber fails or if the fusion fails, the second light The ferrule assembly including a second length of the built-in optical fiber that is longer than the first length is selected as the fiber, and the first optical fiber is cut again to form the fusion splice again. Manufacturing method of catheter for optical coherence tomography apparatus. - 第1の光ファイバを内蔵しており体内に挿入される内装体と、
第2の光ファイバと前記第2の光ファイバの一端側に固定されたフェルールとを含むフェルール組み立て体、及び前記フェルール組み立て体に一端が直接または間接に固定され前記内装体を案内する管を有し、光干渉断層撮影装置のロータリジョイントに接続される光コネクタ部と、
前記第2の光ファイバの他端と前記第1の光ファイバの一端とが互いに融着され、前記管内に位置する融着接続部と
を備える光干渉断層撮影装置用カテーテル。 An interior body containing the first optical fiber and inserted into the body;
A ferrule assembly including a second optical fiber and a ferrule fixed to one end of the second optical fiber, and a pipe that is directly or indirectly fixed to the ferrule assembly and guides the inner body. And an optical connector connected to a rotary joint of the optical coherence tomography apparatus,
A catheter for an optical coherence tomography apparatus, comprising: a second end of the second optical fiber and one end of the first optical fiber which are fused to each other and a fusion splicing portion located in the tube. - 前記光コネクタ部が、
内部に前記第2の光ファイバが挿通されるように前記フェルールに一端が固定された筒状のフランジ部材と、
一端が前記フランジ部材の他端に嵌合され、他端側に前記管が挿入されて固定されている筒状の継ぎ手部材と
を更に有する請求項2に記載の光干渉断層撮影装置用カテーテル。 The optical connector portion is
A cylindrical flange member having one end fixed to the ferrule so that the second optical fiber is inserted therein;
The catheter for an optical coherence tomography apparatus according to claim 2, further comprising a tubular joint member having one end fitted to the other end of the flange member and the tube inserted and fixed to the other end side. - 前記内装体及び前記光コネクタ部を覆い、前記内装体及び前記光コネクタ部の回転の際に静止する外装体を更に備え、
前記外装体はその内側に前記内装体または前記管を支持する支持部を有し、前記継ぎ手部材の他端と前記支持部との距離が、前記光コネクタ部の使用回転数の範囲内において前記管の共振が生じる長さの範囲外である請求項3に記載の光干渉断層撮影装置用カテーテル。 Further comprising an exterior body that covers the interior body and the optical connector portion, and is stationary when the interior body and the optical connector portion are rotated,
The exterior body has a support portion for supporting the interior body or the pipe inside thereof, and the distance between the other end of the joint member and the support portion is within the range of the rotation speed of the optical connector portion. The catheter for an optical coherence tomography apparatus according to claim 3, wherein the catheter is out of a length range in which tube resonance occurs. - 前記継ぎ手部材の前記管が挿入されている部分の前記他端側における、前記管の軸方向に垂直な断面の面積が、該部分の前記一端側における、前記管の軸方向に垂直な断面の面積よりも小さい
請求項3または4に記載の光干渉断層撮影装置用カテーテル。 The area of the cross section perpendicular to the axial direction of the pipe on the other end side of the part where the pipe of the joint member is inserted is the cross section of the cross section perpendicular to the axial direction of the pipe on the one end side of the part. The catheter for optical coherence tomography apparatus of Claim 3 or 4 smaller than an area.
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US14/894,017 US20160116683A1 (en) | 2013-05-29 | 2014-05-29 | Catheter for optical coherence tomograph, and catheter production method |
EP14804662.6A EP3005930A4 (en) | 2013-05-29 | 2014-05-29 | Catheter for optical coherence tomograph, and catheter production method |
CN201480029653.0A CN105263386A (en) | 2013-05-29 | 2014-05-29 | Catheter for optical coherence tomograph, and catheter production method |
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EP (1) | EP3005930A4 (en) |
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